Damper control mechanism



Aug. 16, 1932. c ANDERSON 1,872,213-

" DAMPER common MECHANISM Fiiefi June 18, 1951 Patented Aug. 16,v 1932.

CHARLES H. ANDERSON, OF CHICAGO, 1131311101! DAIPER CONTROL MECHANICS! Application filed June 18, 1931. "Serial No. 545,279.-

More particularly this invention relates to an improved damper and control mechanism for use in the stack pipe of furnaces of boilers, or other types 0 heating apparatus, and

6 especially to such a mechanism which may be operated automatically'by a pressure or other control device on the apparatus.

The general object of the invention is to provide a new and improved damper mecha- 19 nism which is simple in construction and may be readily installed, and which is automatically operable to" run the furnace at high efficiency and cutdown the fuel consumption.

Another object is to provide an improved 35 damper mechanism adapted to beinstalled in the stack pipe of a furnace, and means for connecting the damper for operation by the, pressure or other control means embodying a sliding connection adapted to close the damper quickly when the pressure reaches its normal value, and operable to permit the damper to remain in a substantially closed position if the pressure rises aboveits normal value.

Another object is to provide a, new. and im-.

25 proved damper comprising an inner disk member and a rin member surrounding said disk, together wit means for adjusting said members angularly with respect to each other and for operating them in unison.

the following detailed description taken in connection with the accompanying drawing, in which:

Fig. 1 is an elevational View of a boiler on the boiler is below normal, the damper being substantially wide open.

Fig. 4 is a perspective phantom view of the preferred form of the invention mounted in a pipe and showing the details of con struction.

Further objects will become apparent from F installation showing a preferredform of the invention installed in the stack pipe of a tur counterclockwise direction ue to anincrease ing the damper mechanism when the pressure Fig. 5 is a detailzview of one of the parts. For urposes of disclosure, I have illustrated in'the' drawing and shall hereinafter describe in detail a preferred embodiment of the invention, with the understanding that. I ,do not intend to limit the invention to the particular construction and arrangement. shown, it being contemplated that various changes may be made by those skilled in the artwithout departing from the spirit and scope of the invention as expressed in the appended claims. I

In F ig. 1 of the drawing there is shown a furnace 5 having a stack ipe 6 leading from the upper rear portion t iereof. A pressure control'device 7 is mounted on top of the furnace and embodies a lever 8 pivotally mounted intermediateits ends at 9 and operable by means of a rod 10 which is connected to the usual bellows device or" diaphragm (not To shown). An adjustable weight 11 is mounted on one end of the lever 8. The other end of the lever is connected by means of a'c-hain 12 to a draft control door 13 and is also connected by means of a chain 14 to a control door 15 which is mounted on the rear side of the furnace, to one side of the pipe 6. The chain 14 is preferably provided with a certain amount of slack so that the door 15 will. be opened at a higher pressure than that necesar'y to close the door 13. Thus, as illus-. trated in Fig. 1, wherein the pressure control lever 8 is in a position comparable to normal pressure on the boiler so that the draft door. 13 has been closed, the door 15 is also closed and will not be opened until thepressure control lever has been moved b the rod 10 in a in pressure above normal.

The dam r mechanism, as illustrated most clearly in ig. 4, comprises a. horizontally extending pivotally mounted shaft or rod 16 which passes through diametrically opposite apertures in the pipe 6. One end 17 of this rod is preferably bent substantially perpendicular to the remainder of the rod so as to extend radially therefrom and provide a means or member for rotating the" rod an for indicating its angular" position. The damper preferably comprises an inner disk member 18 secured nonrotatably to the rod 16 in the plane of the radially extending member 17, and an encircling ring member 19which is rotatably mounted on the rod 16 by means of sleeves 20 and 21. These sleeves extend through the wall of the pipe 6 and are rotatable with respect thereto. Preferably an arm or member 22is secured to the sleeve 21 and extends from the sleeve substantially in the plane of the ring member 19 so as to serve as a means for rotating the ring member relatively to the disk member and also as a means for indicating externally ofthe pipe,.

the angular position of the ring member.

Means is preferably provided for ad uSting the disk member 18 angularly relatively'to the'ring member '19 and for securing the two parts-ofthe damper int-heir adjusted positions relatively to each other. As illustrated herein, this means comprises a member 23 which is slidably mounted in a bore extend ing through the end 17 of the rod 16. The member 23 is shown herein in the form of a rod having one end 24 bent so as to extend longitudinally of the rod 16. The portion 24 is arranged to engage a pin which extends radially from the sleeve 21 and has its inner endscrew threaded through a tubular bushing 26, which surrounds the sleeve 21 adjacent its outer end and into clamping engagement with the sleeve 21. Thus by slid ing the member 23 through the end 17 of the rod 16 the portion 24 thereof will swing the pin 25 angularly with respect to the portion 17 and thereby swing thering member 19 singularly with respect to the disk member 18. The rod 23 may be clamped in its ad- 'usted position by means of a nut device 27. I'he pin 25. may be rotated by means of a cross bar 28.

The damper is arranged to be operated au-r tomatically by means of'the pressure control device 7 through intermediate connections which are herein illustrated as including a rod .or arm 29 which extends radially from the bushing 26 and has its inner end screw threaded thereto. A weighted member 30 is preferably secured to one end of a chain and slidably connected to the arm 29. As illustrated herein'the weighted member 30 is mounted on the arm 29 and has an eye-bolt 31 thereon connected to one end of a chain 32. The other end of the chain 32 is provided with a hook 33 so that it may be secured to any one of several links of a chain 34 which extends over roller devices 35 and 36 and has its other end secured to the front end of the lever 8 by means of a clamping device 37 In the installation disclosel in the drawing, the pulley 35 is positioned substantially vertically above the axis of the damper rod 16 in order that the control mechanism will fun c tion efficiently. It has been found that by positioningthe pulley 35 in a vertical plane disposed a distance h from the'vertical plane device 42. This band is through the eye of the weighted member 30 when in the dotted line position shown in Fig. 1, the operation is very successful, the distance 71. being made one and one-fourth inches for each foot of the vertical distance '0 that the shaft 16 is positioned below the pulley 35.

The type ofslidable connection provided between t e weighted member and arm 29 is arranged to provide lost motion principally during the initial movement of the weighted member downwardly from the position shown in Fig. 2 when the weighted member is lowered by action of the pressure control device 7. After the weighted member has descended a certain distance the angular movement imparted to the arm 29 becomes more in proportion to the downward movement of the weighted member 30-. Oppositely, when the weighted member is raised from the position shown in Fig. 3, the arm 29 is moved proportionately during the initial portion of the upward movement of the weighted member so that the lost motion between the parts occurs as the damper approaches its closed position.

The invention is preferably provided with a sheet metal band 40 which is adaptedto fit snugly around the pi vided with outstan in lugs 41 so that it may be wrapped aroun the pipe 6 and then clamped thereto .by means of asuitable screw provided with accurately cut diametrically opposite apertures for the sleeves 20 and 21. The provision of such a band is advantageous in that it permits the workmen installing the device to punch diametrically opposite holes in the pipe 6. If the punched holes should be irregular in shape, or too large, the band 40 is fitted around the pipe so that the accurately finished holes therein" coincide with the punched holes in the pipe. This provides finished bearings for the sleeves 20 and 21 and prevents smoke from leaking out of the punched holes in the pipe.

In installing the device the rod 16 is withdrawn from the damper members 18 and 19, and the ring member 19 is first inserted by compressing the pipe vertically a sufficient amount to bulge the sides and permit the ring member 19 to be inserted and the sleeves 20 and 21 positioned in the holes in the pipe 6 and band 40.

The arm 22 isthen positioned with its bifurcated portion extending into the grooves 45 in the sleeve 21 and the clamping nut 46 tightened against it, after which the bushing 26 is slipped over the outer end of the sleeve 21. The disk member 18 is then positioned within the ring member 19 and the rod 16 inserted from the right-hand end (Fig. 4). The disk member 18 hasspaced lugsefl and 47 thereon provided with substantially circular openings through which the rod 16 passes with a snug fit. Any suitable means )e 6 and is split and pro- 7 may be provided for securing the diskmember 18 non-rotatably' to the rod, but prefer ably this means is adapted to ermit the rod to be secured to the disk memiie'r either with the end portion 17 parallel to thedisk member or at right angles thereto. to adapt the mechanism to both horizontal andlvertical pipes. As illustrated herein, the inner end of the lug 47 has a square recess at 48 and the rod 16 is provided with anapert-ure therethrough in which This pin is inserted with the rod 16 sl ghtly withdrawn toward the right from the position shown in Fig. 4," and snfiiciently long to extenddiagonally across the squared recess 48 and engage nori-rotatably withopposite corners thereof. It will be apparent that the rod may thereby be secured inpositions disposed fromeach other with respect to the disk member 18 and thereby enable the device to be installed either in'a' hori zontal pipe 6, as illustrated in the drawing, or in a vertical pipe.

After the device has beadjusted to fit the and the amount of dra been in stalledit may particular fuel used, tin a particular installation by hooking the chain 32 to the chain 34 so that the parts are substantially in the position illustrated inFig. 3, when there is no fire in the furnace. 'lhen upon building a fire the arm.29 will be movedto approximately the position illustrated in Fig. 1, before the weighted member 30 slides out from the rod 16 and permits an extended vertical movement of the weighted member with a corresponding angular movement of the arm 29. At this point the boiler has perhaps one pound of steam, and the draft door 13 has closed. The door 15 still remains closed but, for the purpose of adjusting the damper mechanism, this door is. opened ap'proximate ly a half inch and then the ring member 19 (with the disk member 18) ismoved toward a closed position until smoke starts coming out of the door 15. The'ring'niember 19 is then secured in this position by means of the pin 25 after which the diskmember 18 isrotated in a counterclockwise direction, as illustratedin the drawing, to open the aperture in the ring member until the smoke stops coming out of the door 15. The disk member 18 is then secured in this adjusted position relatively to the ring member 19 by sliding the rod 23 through the end 17 of the rod 16 until the portion 24 thereof abuts against the pin 25. The thumb screw 27 is I then tightened against the rod 23 to secure the parts in this adjusted osition. I

The device is then a apted to operate automatically andwhen the steam on theboiler increases the weighted member 30 will slide outwardly on thearm 29 at the same time that itrotates thearm and damper secured thereto. However,it willbe apparent that as the arm 29 is rotated toward a've'rtical posia pin 19 maybe inserted.

tion the angular movement ofthe damper'demal steam pressure has been reached the damper is almost closed. If the pressure increases above normal,the damper will'be moved toward the closed position, as, illustrated inFig. 2, which it reaches when the rod 10 of'the'press'ure device 7 is substantiai lly at its greatest height.

ing, claim as my invention:

1. A damper mechanism comprising, in combination, a shaft. adapted to be rotatably invention provides an extremely sim ple mechanism embodyinga novel damper" construction,to ther with efiicient means for mounted in a stack pipe and having a part 4 extending substantially radially from one end thereof, a damper comprising an inner disk. secured to said shaft in the plane of said end part, and an outer ring encirclin said disk and rotatably mounted on sai shaft, a sleeve on said shaft secured at one end t to said ring and arranged to extend out wardly through the pipe wall, a manually operable'device secured to said sleeve for indicating the position of the ring and for moving therin relatively to said shaft, a bushe ing on sai sleeve intermediate said device and the radially extendingend part of saidshaft, 8. pin extending radially from said bushing and screw threaded therethrough so as to be operable to clamp said bushing to said sleeve, means for ad usting said shaft and the disk carriedthereby angularly with respect to said sleeve. and the rin secured theretocomprising a member slidab y mount- I ed in a bore extending transversely through the end part of said shaft and having its end adapted for engagement with said pin, and

means for securing said member in its ad usted position,

a relatively long actuatin arm extendin radially from said shaft an secured to sai I bushing, a weighted member slidable upon said actuating arm, a flexible chain secured at one end to said wei hted member and'extending upwardly there rom, a guide pulley stationarily mounted above said actuating rod over which said chain passes for connection to the ressure control mechanism of the boiler, said weight being positioned adjacent the damperrod when the damper'is open with the actuating arm inclined downwardly, 'said weight, after the actuating arm is rotated to a position above theihorizontal, sliding butwardlyon said arm .so as to decrease the angular movement of the damper relatively to the vertical move- I ment of said Weightedmember.

2. A damper 'mechanism' comprising, in 3 combination, a shaft adapted totbe'rotatably mounted in a stack pipe and having a part extending substantially. radially from one end thereof, a damper comprisin an inner disk secured to said shaft in the part, and an 'outerlring encircling said disk and rotatably mounted on said shaft, a sleeve on said shaft secured at one end to said ring and arranged .to extend outwardly throughthe pipe wall, a bushin on said sleeve ad ashaft, a pin extending radially from said bushing and screw threaded therethrough so as tobe operable to clamp said bushing to said sleeve, means for adjusting said shaft and the disk carried thereby angularly with respect to said sleeveand the ring secured thereto com rising a vmember adjustably mounted on the end part of said shaft and engaging said pin, a relatively long actuating armexof said end part, anda second partrotatably.

mounted on said shaft, a sleeve on said shaft secured at one'end tothe rotatably mounted part and arranged to extend outwardly 40, through the pipe wall, a bushing on said sleeve, a pin ext-ending radiallyrfrom said bushing and screw threaded therethrough so as to be operable to clamp said bushing to said sleeve, means for adjusting said shaft and 4 5 the damper part carried thereby angularly with, respect to said sleeve and the damper part securedtheretocomprising a member secured to andadjustable transversely on the end part of said shaftand having one end adapted for engagement with said pin, and means for securing said member in its adjusted position, a relatively long actuating rod extending radially from said shaft and secured thereto, a weighted member slidable upon said actuating'rod, a flexible chain secured at one end to said weighted member and extending upwardly therefrom, anda guide pulley stationarily mounted above said actuating rod over which said chain passes for connection to the pressure "control mechanism of the boiler.

A damper'mechanism comprising, in combination, a shaft adapted to be, rotatably mounted in a stackipipe and having a part extending substantially radially from one use ane of said end cent the radially exten ing end part of said tending radially from said shaft and secured to'said bushing, a. weighted member slidably r end thereof, a damper comprising an inner disk secured to said shaft in the plane of said end part, and an outer ring encircling said disk androtatably mounted on said shaft, a sleeve on'said shaft secured at one end to said ring and arranged to extend outwardly through the pipe wall, a manually operable device secured, to said sleeve for indicating the, position of the ring and forv moving the rin relatively tosaid shaft, a bushin on sai sleeveintermediate said device an the radially extending end part of said shaft, a pin extending radially from said bushing and screwthreaded thereto so as to be operable to clamp said bushing to said sleeve, means for adjusting said shaft and the disk carried thereby angularly with respect to said sleeve and the ring secured thereto comprising a member slidably. mounted in a bore extend ing transversely through the end part of said shaft and having its end adapted for engagement with said pin, and means for securing said member in its adjusted position, a relatively long actuating rod extending radially from said'shaft andsecured to said bushing, and aelost motion connection betweensaid rod and the pressure control mechanism of the boiler. p

5, Adampermech'anism comprising, in combination, a shaft adapted to be rotatably mounted in a stack pipe and having a part extending substantially radially from on! end thereof, a damper comprising an inner disk secured to said shaft, and an outer rin encirclin said disk and rotatably mounted on said 5 aft, a sleeve on said shaft secured at one end to said ring and arranged to extend outwardly through the pipe wall, a pin extending ra ially from said bushing and screw threaded thereto '50 as to be operable to clamp said bushing to said sleeve, means for adjusting said shaft and the disk carried thereby angularly with respect to said sleeve and the ring secured thereto comprising a member mounted on said end part of said shaft and adapted for engagement with said pin, a relatively long actuating rod extending radially from said shaft and secured to said bushing, and a lost motion connection between said rod :and the pressure control mechanism of the boiler. e L

6. A damper mechanism comprising, in combination, a shaft adapted to be rotatably mounted in a stack pipe, a two-part damper comprising one-partsecured to said shaft and another part rotatably mounted on said shaft, a sleeve on said shaft secured at one end to said rotatably mounted part and arranged to extend outwardly through the pipe Wall, means for adjusting said shaft and the damper part carried thereby angularly with respect to said sleeve and the damper part secured thereto, an actuating arm extending from said shaft and secured thereto, and a lost motion connection between said rod and the pressure control mechanism of the boiler.

, 7. A damper mechanism comprising, in combination, a shaft adapted to be rotatably mounted in a stack pipe, a damper comprising an inner disk secured to said shaft, and

an outer ring encircling said disk and rotatably mounted on said shaft, a member on said shaft secured atone end to said ring and arranged to extend outwardly through the pipe wall, means for adjusting said shaft and the disk carried thereby angularly with respect to said member and the ring secured thereto, an actuating member'secured to said shaft, and a lost motion connection between said actuating member and the pressure control mechanism of the boiler.

8. A damper mechanism comprising, in combination, a rotatably mounted rod. a damper comprising an inner disk member secured to sa1d rod and an outer ring member encircling said disk member and rotatably mounted on said rod, means for adjusting said ring member angularly with respect to said disk member and for securing the members in such adjusted relation, an arm secured at one end to and extending radially from said rod, a weighted member slidably'connected to said arm, and means for connecting said weighted member to an automatic control device on a furnace.

9. A damper mechanism comprising, in combination, a rotatably mounted rod, a damper comprising two parts, one of which is secured to said rod and the other rotatably mounted on said rod, means for adjusting said parts angularly with respect to each other and for securing the parts in such adjusted relation, a rod secured at one end to and extending radially from said first menmounted part and arranged to extend outwardly through the pipe wall means for securing said shaft and the damper part carried thereby angularly with respect to said member and the damper part secured thereto, an actuating arm extending from said shaft, and means forming a lost mot-ion connection between said arm and the pressure control mechanism of the boiler comprising a member actuated by the pressure control mechanism slidably connected to said arm, eflective during the final portion of its movement in one direction to swin said arm, and during the initial portion of its movement in the return direction to return said arm.

In testimony whereof I have hereunto affixed my si ature.

HARLES H. ANDERSON.

tioned rod, a weighted member slidably mounted on said second rod, and means for connecting said weighted member to an an:- tomatic control device on a furnace.

10. A damper mechanism comprising, in combination, a rotatably mounted rod. a damper comprising an inner disk member and an outer ring member encircling said disk member, one of said members being detachably secured to said rod and the other rotatably mounted on said rod, means for adjusting said ring member angularly with respect to said disk member and for securing the members in such adjusted relation, a rod secured at one end to and extending radially from said first mentioned rod, a weighted member slidablv mounted on said second rod, and means for connecting said weighted member to an automatic pressure control device on a furnace.

11. A damper mechanism comprising. in combination, a shaft adapted to be rotatably mounted in a stack pipe, a two-part damper comprising one part secured to said shaft and another part rotatably mounted on said shaft, a member secured at one end to said rotatably 

